But on Friday, he shared a photo from a recent visit to Machu Picchu on WhoSay, adding a thank-you note to his fans for their compassion during a difficult time.

"Hey guys! Just returned from an incredible trip to Peru with my dad and wanted to thank you all for your support these past few weeks ... means the world to me," he wrote. "Love you guys! - Z."

Efron has not commented explicitly on reports that he attended an outpatient rehab clinic in March following a relapse into cocaine and ecstasy use, but sources have told outlets including People and E! News that he's now sober and healthy.